Tom writes in with some great stuff he'd like to share:
I have been using your site for months now as I work on restoring my 72 R5C. I was kindly sent these files though from a fellow two stroker I met though Craigslist. He insisted that since this info is so hard to find that I should share it in any way possible. So I am sending it to you for if you want it on your site. I am not sure of the legality of this though. This info is very old and I doubt any publisher will say anything, but you never know. These files are quite large though and will take a while for people on dial-up. They have all been worth their weight in gold to get my R5C on the way to running again. Maybe in return if anyone knows of a killer deal on a pair of carbs for my bike they can drop me a line?
Here are links to the files. They're rather large, so be prepared for long download times:
Yamaha Service Manual for DS7, RD250, R5C & RD350 1972-1973
Yamaha Motor Corp, 1974
51.75MB, 113 pages
How to Fix your Yamaha Two Cylinder, Two Stroke Motorcycle
Intertec Publishing Corp, 1975
76.25MB , 86 pages
Yamaha 250-400cc 2-Stroke Twins - 1965 - 1978 - Service and Repair Manual
Clymer Publications, 1978
88.55MB, 190 pages
And please, let me know if you can help Tom out with a set of carbs!